Reinforced interface endows the lithium anode with stable cycle at high-temperature of 80 °C

Embracing ultrahigh theoretical capacity of 3860 mA h g−1 and the lowest reduction potential of −3.04 V (versus standard hydrogen electrode), lithium (Li) is considered as the “holy grail” material for pursuing higher energy density, of which application has been challenged due to the unstable interface caused by the non-uniform electrodeposition as well as high chemical activity. Operating at higher temperature can be recommended to uniform electrodeposition of Li metal. Nevertheless, the intrinsic side-reaction between Li metal anode and electrolyte is inevitably aggravated and thus fosters the failure of Li metal anode rapidly with uneven electrodeposition. Here, a kind of temperature-tolerated ionic liquid (1-methyl-3-ethylimidazole bis(fluorosulfonyl)imide/lithium bis(trifluoromethylsulfonyl)imide, EF/LT) based electrolyte that matrixed with poly(vinylidene fluoride-hexafluoropropylene) was designed to maintain the interfacial stabilization of Li metal due to the weak interfacial reaction and uniform electrodeposition at high temperature of 80 °C. It is the matter that the 660-h cycle with lower polarization is achieved with EF/LT-based electrolyte at temperature of 80 oC and the full cell embraces outstanding cyclic performance, without capacity fading within 100 cycles. Delighting, a door for practical application of Li metal anode for higher energy density as the carbon neutrality progresses in the blooming human society has been opened gradually.